> On 31 Oct 2024, at 14:51, Igor Khanin <i...@khanin.biz> wrote: > > Greetings, > > I hope this is the right place to post this. I'm looking for advice as well > as any historical context I can get. > > The documentation states that the `QTextFormat::LayoutDirection` text format > property is both a paragraph and a character property. When set on a block > format, it indeed affects the block's base direction via > `QTextBlock::textDirection`. However when set on a character format, to the > best of my understanding it appears to have no effect whatsoever. I'd expect > it to have some sort of similar impact on the BiDi algorithm - perhaps > overriding the directional character type of the character to be L or R, or > maybe making a sequence of characters with the same property value behave as > if they were an isolation run, or some such. But that can't obviously happen > currently, as `QBidiAlgorithm` has no access to any formats and finishes its' > work before character formats are resolved anyway. > > This appears to be the case since Scribe was first released back in Qt 4, or > at the very least predates the current Git history. So my question is why > then the documentation says that? Was there an intention to implement some > behavior that then never happened? > > Furthermore - would it make sense for this property to start _actually_ doing > anything on individual characters? I have a hacky POC, but don't want to > waste my own and other's time if this is something that would be considered > too niche or disruptive. > > Best, > Igor
Hi Igor, It’s the right place to post this, but it would help to understand what you are trying to achieve with an implementation of layout direction on as a character format. My understanding of the subject doesn't go very deep (and I can’t say if the documentation is wrong or simply misleading - perhaps it’s a read-only attribute), but to change layout direction within a block, you’d usually insert Unicode control characters into your text. Volker -- Development mailing list Development@qt-project.org https://lists.qt-project.org/listinfo/development
